diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
index e2c348b..50ec42f 100644
--- a/net/openvswitch/flow.c
+++ b/net/openvswitch/flow.c
@@ -717,6 +717,8 @@
 {
 	int err;
 
+	memset(key, 0, OVS_SW_FLOW_KEY_METADATA_SIZE);
+
 	/* Extract metadata from netlink attributes. */
 	err = ovs_nla_get_flow_metadata(attr, key, log);
 	if (err)